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Rebar <br /> * ' Multiple Cracks <br /> ,r <br /> Joint <br /> Infiltration Stain <br /> Crack <br /> Lake Shore-84"pipe Lake Shore <br /> Figure 5. Cracking and deterioration. Figure 6. Map cracking over large area of pipe. <br /> The Lake Shore Drive sewer rehabilitation design employs trenchless construction methods that <br /> include lining manholes and installing a liner the length of the sewer. There are two major lining <br /> processes that will be used on this project. <br /> Process 1. Spiral Wound Pipe Liner: This process will be used on the Division A portion of <br /> the project with pipe sizes ranging in size from 7 feet in diameter to 4 'h feet in <br /> diameter. This process involves inserting a lining consisting of steel reinforced <br /> PVC strips, similar in appearance to a large continuous strip of vinyl siding (see <br /> Figure 7 below). The spiral strips are connected together to form a new pipe <br /> surface(Figure 8). The small void on the outside of the pipe is then filled with a <br /> cement grout that holds the new liner firmly in place. <br /> W�. <br /> r � <br /> i <br /> i NXI <br /> Figure 7. Spiral wound liner strip. Figure 8. Lined section of sewer. <br /> A strong advantage with the Spiral Wound system is that it can be installed <br /> without blocking flows in the sewer. This reduces the cost significantly by not <br /> requiring by-pass pumping of sewage around the work area. <br /> Page 19 <br />